MaterialNavigationPage not change anything on the Navigation Bar

[ahmadmaaly]

Hello Sir , I am trying to use the MaterialNavigationPage ,with this settings :

xmlns:material="clr-namespace:XF.Material.Forms.UI;assembly=XF.Material" material:MaterialNavigationPage.AppBarColor="#2c3e50" material:MaterialNavigationPage.AppBarTitleTextFontFamily="Roboto" material:MaterialNavigationPage.AppBarTitleTextFontSize="14" material:MaterialNavigationPage.StatusBarColor="#1B3147" material:MaterialNavigationPage.AppBarTitleTextAlignment="Start"

nothing change in the navigation bar
all other material controls work fine

I am not use the navigationPage.TitleView Also

can you help me please
thanks

Xamarin Forms V5